/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:10:50,434 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:10:50,438 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:10:50,458 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:10:50,459 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:10:50,461 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:10:50,463 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:10:50,475 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:10:50,479 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:10:50,481 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:10:50,482 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:10:50,485 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:10:50,485 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:10:50,488 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:10:50,490 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:10:50,491 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:10:50,493 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:10:50,494 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:10:50,496 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:10:50,501 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:10:50,507 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:10:50,510 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:10:50,512 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:10:50,513 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:10:50,516 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:10:50,527 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:10:50,528 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:10:50,529 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:10:50,530 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 13:10:50,564 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:10:50,565 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:10:50,566 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:10:50,568 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:10:50,568 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:10:50,568 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:10:50,569 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:10:50,569 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:10:50,569 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:10:50,569 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:10:50,574 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:10:50,575 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:10:50,575 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:10:50,575 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:10:50,575 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:10:50,575 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:10:50,576 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:10:50,576 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:10:50,576 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:10:50,576 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:10:50,576 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:10:50,577 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:10:50,577 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:10:50,577 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:10:50,577 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:10:50,577 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:10:50,578 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:50,578 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:10:50,578 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:10:50,578 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 13:10:50,870 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:10:50,884 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:10:50,888 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:10:50,890 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:10:50,890 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:10:50,891 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c [2020-07-21 13:10:50,978 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aaf808ae9/6f229afe8abb46aa8f628840a2a792eb/FLAG5b927ac57 [2020-07-21 13:10:51,486 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:10:51,487 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c [2020-07-21 13:10:51,494 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aaf808ae9/6f229afe8abb46aa8f628840a2a792eb/FLAG5b927ac57 [2020-07-21 13:10:51,930 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aaf808ae9/6f229afe8abb46aa8f628840a2a792eb [2020-07-21 13:10:51,942 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:10:51,945 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:10:51,946 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:10:51,947 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:10:51,950 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:10:51,952 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:10:51" (1/1) ... [2020-07-21 13:10:51,955 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12e96d29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:51, skipping insertion in model container [2020-07-21 13:10:51,955 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:10:51" (1/1) ... [2020-07-21 13:10:51,963 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:10:51,983 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:10:52,154 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:10:52,161 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:10:52,185 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:10:52,202 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:10:52,203 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:52 WrapperNode [2020-07-21 13:10:52,203 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:10:52,204 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:10:52,204 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:10:52,204 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:10:52,219 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:52" (1/1) ... [2020-07-21 13:10:52,221 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:52" (1/1) ... [2020-07-21 13:10:52,229 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:52" (1/1) ... [2020-07-21 13:10:52,229 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:52" (1/1) ... [2020-07-21 13:10:52,321 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:52" (1/1) ... [2020-07-21 13:10:52,324 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:52" (1/1) ... [2020-07-21 13:10:52,325 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:52" (1/1) ... [2020-07-21 13:10:52,327 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:10:52,328 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:10:52,328 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:10:52,329 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:10:52,330 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:52" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:10:52,392 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:10:52,392 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:10:52,393 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 13:10:52,393 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 13:10:52,393 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:10:52,393 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:10:52,393 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:10:52,394 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 13:10:52,394 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 13:10:52,394 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:10:52,394 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:10:52,394 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:10:52,597 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:10:52,597 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:10:52,602 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:10:52 BoogieIcfgContainer [2020-07-21 13:10:52,602 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:10:52,604 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:10:52,604 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:10:52,607 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:10:52,608 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:10:51" (1/3) ... [2020-07-21 13:10:52,608 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b6144fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:10:52, skipping insertion in model container [2020-07-21 13:10:52,609 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:52" (2/3) ... [2020-07-21 13:10:52,609 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b6144fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:10:52, skipping insertion in model container [2020-07-21 13:10:52,609 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:10:52" (3/3) ... [2020-07-21 13:10:52,611 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_10-2.c [2020-07-21 13:10:52,628 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:10:52,640 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:10:52,657 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:10:52,687 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:10:52,688 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:10:52,688 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:10:52,688 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:10:52,688 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:10:52,688 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:10:52,689 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:10:52,689 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:10:52,715 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 13:10:52,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:10:52,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:52,729 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:52,730 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:52,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:52,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 13:10:52,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:52,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1899571823] [2020-07-21 13:10:52,753 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:52,821 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:52,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:52,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:10:52,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:52,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:10:52,923 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:10:52,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1899571823] [2020-07-21 13:10:52,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:10:52,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:10:52,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367520369] [2020-07-21 13:10:52,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:10:52,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:52,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:10:52,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:10:52,945 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 13:10:53,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:53,063 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 13:10:53,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:10:53,065 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:10:53,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:53,076 INFO L225 Difference]: With dead ends: 44 [2020-07-21 13:10:53,077 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 13:10:53,081 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:10:53,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 13:10:53,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 13:10:53,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 13:10:53,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 13:10:53,131 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 13:10:53,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:53,132 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 13:10:53,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:10:53,132 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 13:10:53,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 13:10:53,135 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:53,135 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:53,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:53,350 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:53,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:53,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 13:10:53,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:53,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1185976332] [2020-07-21 13:10:53,353 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:53,391 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:53,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:53,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:10:53,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:53,435 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:10:53,436 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:10:53,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1185976332] [2020-07-21 13:10:53,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:10:53,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:10:53,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675577591] [2020-07-21 13:10:53,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:10:53,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:53,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:10:53,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:10:53,440 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 13:10:53,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:53,503 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 13:10:53,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:10:53,504 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 13:10:53,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:53,506 INFO L225 Difference]: With dead ends: 36 [2020-07-21 13:10:53,506 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 13:10:53,507 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:10:53,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 13:10:53,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 13:10:53,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 13:10:53,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 13:10:53,517 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 13:10:53,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:53,518 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 13:10:53,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:10:53,518 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 13:10:53,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:10:53,520 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:53,520 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:53,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:53,736 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:53,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:53,738 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 13:10:53,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:53,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1394593561] [2020-07-21 13:10:53,740 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:53,773 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:53,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:53,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:10:53,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:53,857 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 13:10:53,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:54,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:54,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:54,137 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 13:10:54,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1394593561] [2020-07-21 13:10:54,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:54,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 13:10:54,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160065217] [2020-07-21 13:10:54,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 13:10:54,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:54,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 13:10:54,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:10:54,147 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 13:10:54,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:54,282 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 13:10:54,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:10:54,283 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 13:10:54,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:54,285 INFO L225 Difference]: With dead ends: 41 [2020-07-21 13:10:54,285 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 13:10:54,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:10:54,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 13:10:54,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 13:10:54,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 13:10:54,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 13:10:54,296 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 13:10:54,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:54,297 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 13:10:54,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 13:10:54,297 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 13:10:54,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:10:54,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:54,299 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:54,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:54,514 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:54,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:54,514 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 13:10:54,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:54,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [603408516] [2020-07-21 13:10:54,515 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:54,548 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:54,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:54,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:10:54,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:54,586 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 13:10:54,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:54,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:54,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:54,789 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 13:10:54,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [603408516] [2020-07-21 13:10:54,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:54,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 13:10:54,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426609945] [2020-07-21 13:10:54,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 13:10:54,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:54,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 13:10:54,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:10:54,794 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 13:10:54,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:54,936 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 13:10:54,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:10:54,936 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 13:10:54,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:54,939 INFO L225 Difference]: With dead ends: 46 [2020-07-21 13:10:54,939 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 13:10:54,940 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:10:54,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 13:10:54,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 13:10:54,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 13:10:54,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 13:10:54,958 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 13:10:54,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:54,959 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 13:10:54,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 13:10:54,959 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 13:10:54,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 13:10:54,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:54,964 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:55,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:55,179 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:55,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:55,180 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 13:10:55,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:55,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [704359887] [2020-07-21 13:10:55,181 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:55,213 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:55,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:55,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:10:55,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:55,285 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 13:10:55,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:55,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:55,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:55,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:55,678 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 13:10:55,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [704359887] [2020-07-21 13:10:55,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:55,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 13:10:55,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806293059] [2020-07-21 13:10:55,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:10:55,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:55,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:10:55,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:10:55,681 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 13:10:55,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:55,862 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 13:10:55,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:10:55,862 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 13:10:55,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:55,864 INFO L225 Difference]: With dead ends: 51 [2020-07-21 13:10:55,865 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 13:10:55,865 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:10:55,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 13:10:55,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 13:10:55,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 13:10:55,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 13:10:55,876 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 13:10:55,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:55,876 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 13:10:55,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:10:55,876 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 13:10:55,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 13:10:55,878 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:55,878 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:56,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:56,088 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:56,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:56,089 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 13:10:56,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:56,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438703781] [2020-07-21 13:10:56,091 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:56,121 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:56,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:56,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:10:56,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:56,174 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 13:10:56,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:56,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:56,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:56,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:56,484 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 13:10:56,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438703781] [2020-07-21 13:10:56,485 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:56,485 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 13:10:56,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141685655] [2020-07-21 13:10:56,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:10:56,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:56,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:10:56,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:10:56,487 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 13:10:56,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:56,670 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-21 13:10:56,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:10:56,670 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 13:10:56,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:56,677 INFO L225 Difference]: With dead ends: 56 [2020-07-21 13:10:56,677 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 13:10:56,678 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:10:56,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 13:10:56,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-21 13:10:56,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 13:10:56,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 13:10:56,695 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-21 13:10:56,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:56,695 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 13:10:56,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:10:56,696 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 13:10:56,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 13:10:56,697 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:56,698 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:56,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:56,915 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:56,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:56,915 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-21 13:10:56,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:56,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733533332] [2020-07-21 13:10:56,916 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:56,973 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:56,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:56,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:10:56,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:57,031 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 13:10:57,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:57,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:57,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:57,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:57,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:57,567 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 13:10:57,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733533332] [2020-07-21 13:10:57,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:57,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 13:10:57,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415454690] [2020-07-21 13:10:57,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:10:57,569 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:57,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:10:57,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:10:57,570 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-21 13:10:57,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:57,785 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-21 13:10:57,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:10:57,786 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-21 13:10:57,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:57,789 INFO L225 Difference]: With dead ends: 61 [2020-07-21 13:10:57,789 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 13:10:57,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:10:57,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 13:10:57,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-21 13:10:57,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 13:10:57,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 13:10:57,802 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-21 13:10:57,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:57,802 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 13:10:57,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:10:57,803 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 13:10:57,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 13:10:57,805 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:57,805 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:58,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:58,016 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:58,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:58,016 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-21 13:10:58,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:58,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [394635441] [2020-07-21 13:10:58,018 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:58,055 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:58,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:58,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:10:58,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:58,133 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-21 13:10:58,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:58,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:58,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:58,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:58,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:58,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:58,653 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 13:10:58,654 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [394635441] [2020-07-21 13:10:58,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:58,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 13:10:58,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228745368] [2020-07-21 13:10:58,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:10:58,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:58,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:10:58,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:10:58,658 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-21 13:10:58,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:58,870 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-21 13:10:58,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:10:58,870 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-21 13:10:58,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:58,872 INFO L225 Difference]: With dead ends: 66 [2020-07-21 13:10:58,873 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 13:10:58,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:10:58,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 13:10:58,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-21 13:10:58,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 13:10:58,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 13:10:58,887 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-21 13:10:58,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:58,887 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 13:10:58,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:10:58,888 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 13:10:58,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 13:10:58,891 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:58,891 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:59,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:59,106 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:59,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:59,107 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-21 13:10:59,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:59,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1378770841] [2020-07-21 13:10:59,109 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:59,158 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:59,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:59,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:10:59,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:59,245 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 13:10:59,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:59,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:59,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:59,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,141 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-21 13:11:00,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1378770841] [2020-07-21 13:11:00,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:00,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 13:11:00,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004053126] [2020-07-21 13:11:00,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:11:00,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:00,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:11:00,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:11:00,146 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-21 13:11:00,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:00,402 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-21 13:11:00,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:11:00,403 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-21 13:11:00,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:00,406 INFO L225 Difference]: With dead ends: 71 [2020-07-21 13:11:00,406 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 13:11:00,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:11:00,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 13:11:00,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-21 13:11:00,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 13:11:00,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 13:11:00,421 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-21 13:11:00,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:00,422 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 13:11:00,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:11:00,422 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 13:11:00,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-21 13:11:00,425 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:00,425 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:00,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:00,640 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:00,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:00,641 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-21 13:11:00,642 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:00,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [275109170] [2020-07-21 13:11:00,643 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:00,727 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:00,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:00,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:11:00,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:00,802 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 13:11:00,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:01,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:01,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:01,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:01,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:01,699 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-21 13:11:01,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [275109170] [2020-07-21 13:11:01,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:01,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 13:11:01,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052767477] [2020-07-21 13:11:01,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:11:01,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:01,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:11:01,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:11:01,706 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 16 states. [2020-07-21 13:11:01,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:01,937 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-21 13:11:01,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:11:01,938 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2020-07-21 13:11:01,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:01,940 INFO L225 Difference]: With dead ends: 76 [2020-07-21 13:11:01,940 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 13:11:01,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:11:01,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 13:11:01,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-21 13:11:01,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 13:11:01,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 13:11:01,968 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-21 13:11:01,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:01,969 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 13:11:01,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:11:01,969 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 13:11:01,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-21 13:11:01,972 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:01,972 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:02,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:02,176 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:02,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:02,176 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-21 13:11:02,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:02,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [347666512] [2020-07-21 13:11:02,178 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:02,273 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:02,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:02,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:11:02,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:02,384 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-21 13:11:02,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:03,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:03,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:03,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:03,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:03,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:03,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:03,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:03,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:04,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-21 13:11:04,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [347666512] [2020-07-21 13:11:04,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:04,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 13:11:04,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633801682] [2020-07-21 13:11:04,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:11:04,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:04,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:11:04,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:11:04,042 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 18 states. [2020-07-21 13:11:04,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:04,320 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-21 13:11:04,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:11:04,320 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 208 [2020-07-21 13:11:04,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:04,323 INFO L225 Difference]: With dead ends: 81 [2020-07-21 13:11:04,323 INFO L226 Difference]: Without dead ends: 77 [2020-07-21 13:11:04,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 13:11:04,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-21 13:11:04,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-21 13:11:04,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 13:11:04,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-21 13:11:04,334 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-21 13:11:04,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:04,335 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-21 13:11:04,335 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:11:04,335 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-21 13:11:04,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 13:11:04,337 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:04,337 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:04,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:04,551 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:04,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:04,552 INFO L82 PathProgramCache]: Analyzing trace with hash 1180347891, now seen corresponding path program 2 times [2020-07-21 13:11:04,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:04,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [72064533] [2020-07-21 13:11:04,553 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:04,638 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:04,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:04,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:11:04,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:04,714 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 149 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-21 13:11:04,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:05,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:05,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:05,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:05,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:06,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:06,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:06,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:06,168 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-21 13:11:06,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [72064533] [2020-07-21 13:11:06,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:06,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 13:11:06,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98554783] [2020-07-21 13:11:06,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:11:06,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:06,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:11:06,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:11:06,171 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 18 states. [2020-07-21 13:11:06,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:06,439 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2020-07-21 13:11:06,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:11:06,439 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 121 [2020-07-21 13:11:06,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:06,441 INFO L225 Difference]: With dead ends: 86 [2020-07-21 13:11:06,442 INFO L226 Difference]: Without dead ends: 82 [2020-07-21 13:11:06,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 214 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 13:11:06,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-21 13:11:06,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-07-21 13:11:06,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 13:11:06,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-21 13:11:06,452 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 121 [2020-07-21 13:11:06,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:06,453 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-21 13:11:06,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:11:06,453 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-21 13:11:06,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-07-21 13:11:06,456 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:06,456 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 11, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:06,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:06,670 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:06,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:06,671 INFO L82 PathProgramCache]: Analyzing trace with hash 2099307065, now seen corresponding path program 5 times [2020-07-21 13:11:06,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:06,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [992576456] [2020-07-21 13:11:06,672 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:06,785 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:06,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:06,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:11:06,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:06,905 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 331 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-21 13:11:06,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:08,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:08,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:08,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:08,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:08,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:09,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:09,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:09,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:09,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:09,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:09,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:09,205 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 352 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2020-07-21 13:11:09,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [992576456] [2020-07-21 13:11:09,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:09,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 13:11:09,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392920331] [2020-07-21 13:11:09,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 13:11:09,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:09,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 13:11:09,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:11:09,208 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 20 states. [2020-07-21 13:11:09,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:09,605 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-07-21 13:11:09,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:11:09,606 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2020-07-21 13:11:09,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:09,609 INFO L225 Difference]: With dead ends: 91 [2020-07-21 13:11:09,609 INFO L226 Difference]: Without dead ends: 87 [2020-07-21 13:11:09,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 359 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 13:11:09,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-21 13:11:09,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 60. [2020-07-21 13:11:09,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 13:11:09,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-21 13:11:09,621 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 195 [2020-07-21 13:11:09,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:09,621 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-21 13:11:09,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 13:11:09,622 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-21 13:11:09,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-21 13:11:09,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:09,625 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 12, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:09,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:09,838 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:09,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:09,838 INFO L82 PathProgramCache]: Analyzing trace with hash 266210309, now seen corresponding path program 3 times [2020-07-21 13:11:09,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:09,839 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [713439632] [2020-07-21 13:11:09,839 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:09,968 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:09,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:09,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:11:09,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:10,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 347 refuted. 0 times theorem prover too weak. 658 trivial. 0 not checked. [2020-07-21 13:11:10,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:11,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:11,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:11,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:11,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:12,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:12,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:12,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:12,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:12,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 371 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-21 13:11:12,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [713439632] [2020-07-21 13:11:12,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:12,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 13:11:12,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689546349] [2020-07-21 13:11:12,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 13:11:12,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:12,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 13:11:12,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:11:12,331 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 20 states. [2020-07-21 13:11:12,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:12,713 INFO L93 Difference]: Finished difference Result 96 states and 212 transitions. [2020-07-21 13:11:12,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:11:12,714 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 201 [2020-07-21 13:11:12,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:12,720 INFO L225 Difference]: With dead ends: 96 [2020-07-21 13:11:12,720 INFO L226 Difference]: Without dead ends: 92 [2020-07-21 13:11:12,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 370 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 13:11:12,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-21 13:11:12,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2020-07-21 13:11:12,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 13:11:12,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-21 13:11:12,737 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 201 [2020-07-21 13:11:12,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:12,738 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-21 13:11:12,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 13:11:12,738 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-21 13:11:12,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-21 13:11:12,745 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:12,746 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 22, 21, 21, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 10, 10, 10, 10, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:12,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:12,959 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:12,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:12,960 INFO L82 PathProgramCache]: Analyzing trace with hash -865443995, now seen corresponding path program 6 times [2020-07-21 13:11:12,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:12,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [483503865] [2020-07-21 13:11:12,961 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:13,159 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:13,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:13,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 785 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:11:13,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:13,341 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 819 refuted. 0 times theorem prover too weak. 2713 trivial. 0 not checked. [2020-07-21 13:11:13,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:15,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:15,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:17,072 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 849 refuted. 0 times theorem prover too weak. 2683 trivial. 0 not checked. [2020-07-21 13:11:17,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [483503865] [2020-07-21 13:11:17,074 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:17,074 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 13:11:17,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379776161] [2020-07-21 13:11:17,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 13:11:17,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:17,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 13:11:17,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 13:11:17,077 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 22 states. [2020-07-21 13:11:17,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:17,572 INFO L93 Difference]: Finished difference Result 101 states and 232 transitions. [2020-07-21 13:11:17,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:11:17,574 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 351 [2020-07-21 13:11:17,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:17,578 INFO L225 Difference]: With dead ends: 101 [2020-07-21 13:11:17,578 INFO L226 Difference]: Without dead ends: 97 [2020-07-21 13:11:17,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 667 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 13:11:17,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-21 13:11:17,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2020-07-21 13:11:17,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 13:11:17,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-21 13:11:17,604 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 351 [2020-07-21 13:11:17,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:17,605 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-21 13:11:17,605 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 13:11:17,605 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-21 13:11:17,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-21 13:11:17,612 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:17,612 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 22, 21, 21, 14, 14, 14, 14, 14, 14, 14, 14, 12, 10, 10, 10, 10, 10, 10, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:17,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:17,828 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:17,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:17,829 INFO L82 PathProgramCache]: Analyzing trace with hash 1413996641, now seen corresponding path program 3 times [2020-07-21 13:11:17,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:17,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2155262] [2020-07-21 13:11:17,830 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:18,052 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:18,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:18,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 751 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:11:18,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:18,229 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 762 refuted. 0 times theorem prover too weak. 2319 trivial. 0 not checked. [2020-07-21 13:11:18,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:20,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:20,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:20,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:21,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:21,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:21,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:21,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:21,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:21,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:22,058 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 795 refuted. 0 times theorem prover too weak. 2286 trivial. 0 not checked. [2020-07-21 13:11:22,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2155262] [2020-07-21 13:11:22,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:22,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 13:11:22,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157341646] [2020-07-21 13:11:22,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 13:11:22,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:22,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 13:11:22,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 13:11:22,061 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 22 states. [2020-07-21 13:11:22,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:22,532 INFO L93 Difference]: Finished difference Result 106 states and 254 transitions. [2020-07-21 13:11:22,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:11:22,532 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 337 [2020-07-21 13:11:22,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:22,536 INFO L225 Difference]: With dead ends: 106 [2020-07-21 13:11:22,536 INFO L226 Difference]: Without dead ends: 102 [2020-07-21 13:11:22,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 638 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 13:11:22,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-21 13:11:22,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 65. [2020-07-21 13:11:22,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 13:11:22,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-21 13:11:22,554 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 337 [2020-07-21 13:11:22,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:22,556 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-21 13:11:22,556 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 13:11:22,556 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-21 13:11:22,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 820 [2020-07-21 13:11:22,564 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:22,565 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 52, 52, 47, 36, 36, 36, 36, 36, 36, 36, 36, 26, 26, 26, 26, 26, 26, 26, 26, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:22,777 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:22,778 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:22,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:22,779 INFO L82 PathProgramCache]: Analyzing trace with hash -1230346157, now seen corresponding path program 7 times [2020-07-21 13:11:22,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:22,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517185713] [2020-07-21 13:11:22,781 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:23,210 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:23,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:23,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 1829 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:11:23,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:23,817 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2371 refuted. 0 times theorem prover too weak. 17847 trivial. 0 not checked. [2020-07-21 13:11:23,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:27,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:28,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:29,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:29,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:29,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:29,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:30,803 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2411 refuted. 0 times theorem prover too weak. 17807 trivial. 0 not checked. [2020-07-21 13:11:30,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517185713] [2020-07-21 13:11:30,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:30,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-21 13:11:30,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031745021] [2020-07-21 13:11:30,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 13:11:30,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:30,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 13:11:30,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-21 13:11:30,807 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 24 states. [2020-07-21 13:11:31,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:31,355 INFO L93 Difference]: Finished difference Result 111 states and 276 transitions. [2020-07-21 13:11:31,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:11:31,356 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 819 [2020-07-21 13:11:31,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:31,359 INFO L225 Difference]: With dead ends: 111 [2020-07-21 13:11:31,359 INFO L226 Difference]: Without dead ends: 107 [2020-07-21 13:11:31,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1648 GetRequests, 1599 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 13:11:31,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-21 13:11:31,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2020-07-21 13:11:31,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 13:11:31,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-21 13:11:31,372 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 819 [2020-07-21 13:11:31,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:31,373 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-21 13:11:31,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 13:11:31,373 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-21 13:11:31,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-21 13:11:31,376 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:31,376 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 27, 24, 24, 18, 18, 18, 18, 18, 18, 18, 18, 15, 12, 12, 12, 12, 12, 12, 12, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:31,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:31,591 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:31,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:31,592 INFO L82 PathProgramCache]: Analyzing trace with hash 2047786411, now seen corresponding path program 4 times [2020-07-21 13:11:31,592 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:31,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [221578574] [2020-07-21 13:11:31,593 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:31,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:31,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:31,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 931 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:11:31,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:32,098 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1118 refuted. 0 times theorem prover too weak. 3842 trivial. 0 not checked. [2020-07-21 13:11:32,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:34,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:35,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:35,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:36,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:36,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:36,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:37,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:37,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:37,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:37,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:37,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:37,373 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1162 refuted. 0 times theorem prover too weak. 3798 trivial. 0 not checked. [2020-07-21 13:11:37,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [221578574] [2020-07-21 13:11:37,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:37,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:11:37,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353138239] [2020-07-21 13:11:37,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:11:37,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:37,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:11:37,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:11:37,376 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 23 states. [2020-07-21 13:11:37,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:37,941 INFO L93 Difference]: Finished difference Result 116 states and 300 transitions. [2020-07-21 13:11:37,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:11:37,941 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 418 [2020-07-21 13:11:37,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:37,947 INFO L225 Difference]: With dead ends: 116 [2020-07-21 13:11:37,947 INFO L226 Difference]: Without dead ends: 112 [2020-07-21 13:11:37,948 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 845 GetRequests, 796 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:11:37,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-21 13:11:37,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 70. [2020-07-21 13:11:37,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 13:11:37,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-21 13:11:37,963 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 418 [2020-07-21 13:11:37,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:37,964 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-21 13:11:37,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:11:37,964 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-21 13:11:37,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 677 [2020-07-21 13:11:37,970 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:37,970 INFO L422 BasicCegarLoop]: trace histogram [62, 62, 42, 41, 41, 31, 31, 31, 31, 31, 31, 31, 31, 20, 20, 20, 20, 20, 20, 20, 20, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:38,183 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:38,184 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:38,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:38,184 INFO L82 PathProgramCache]: Analyzing trace with hash -1777656900, now seen corresponding path program 8 times [2020-07-21 13:11:38,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:38,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2099355914] [2020-07-21 13:11:38,185 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:38,592 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:38,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:38,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 1510 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:11:38,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:38,943 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2104 refuted. 0 times theorem prover too weak. 11666 trivial. 0 not checked. [2020-07-21 13:11:38,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:42,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:42,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:44,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:44,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:45,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:46,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:46,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:46,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,592 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2156 refuted. 0 times theorem prover too weak. 11614 trivial. 0 not checked. [2020-07-21 13:11:47,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2099355914] [2020-07-21 13:11:47,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:47,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 13:11:47,594 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890754935] [2020-07-21 13:11:47,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:11:47,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:47,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:11:47,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:11:47,596 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 25 states. [2020-07-21 13:11:48,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:48,251 INFO L93 Difference]: Finished difference Result 121 states and 324 transitions. [2020-07-21 13:11:48,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:11:48,252 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 676 [2020-07-21 13:11:48,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:48,257 INFO L225 Difference]: With dead ends: 121 [2020-07-21 13:11:48,257 INFO L226 Difference]: Without dead ends: 117 [2020-07-21 13:11:48,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1363 GetRequests, 1309 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 13:11:48,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-21 13:11:48,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 75. [2020-07-21 13:11:48,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-21 13:11:48,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 145 transitions. [2020-07-21 13:11:48,269 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 145 transitions. Word has length 676 [2020-07-21 13:11:48,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:48,270 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 145 transitions. [2020-07-21 13:11:48,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:11:48,271 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 145 transitions. [2020-07-21 13:11:48,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 755 [2020-07-21 13:11:48,277 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:48,278 INFO L422 BasicCegarLoop]: trace histogram [64, 64, 49, 47, 47, 32, 32, 32, 32, 32, 32, 32, 32, 26, 23, 23, 23, 23, 23, 23, 23, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:48,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:48,492 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:48,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:48,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1813836186, now seen corresponding path program 4 times [2020-07-21 13:11:48,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:48,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1912397465] [2020-07-21 13:11:48,494 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:49,004 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:49,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:49,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 1678 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:11:49,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:49,392 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2048 refuted. 0 times theorem prover too weak. 14594 trivial. 0 not checked. [2020-07-21 13:11:49,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:52,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:52,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:54,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:55,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:55,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:55,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:56,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:56,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:56,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:56,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:56,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:56,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:56,767 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2088 refuted. 0 times theorem prover too weak. 14554 trivial. 0 not checked. [2020-07-21 13:11:56,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1912397465] [2020-07-21 13:11:56,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:56,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:11:56,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572055033] [2020-07-21 13:11:56,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:11:56,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:56,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:11:56,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:11:56,769 INFO L87 Difference]: Start difference. First operand 75 states and 145 transitions. Second operand 23 states. [2020-07-21 13:11:57,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:57,383 INFO L93 Difference]: Finished difference Result 159 states and 539 transitions. [2020-07-21 13:11:57,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:11:57,384 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 754 [2020-07-21 13:11:57,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:57,390 INFO L225 Difference]: With dead ends: 159 [2020-07-21 13:11:57,390 INFO L226 Difference]: Without dead ends: 155 [2020-07-21 13:11:57,391 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1517 GetRequests, 1468 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:11:57,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-21 13:11:57,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 77. [2020-07-21 13:11:57,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-21 13:11:57,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 152 transitions. [2020-07-21 13:11:57,410 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 152 transitions. Word has length 754 [2020-07-21 13:11:57,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:57,410 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 152 transitions. [2020-07-21 13:11:57,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:11:57,411 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 152 transitions. [2020-07-21 13:11:57,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 766 [2020-07-21 13:11:57,418 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:57,418 INFO L422 BasicCegarLoop]: trace histogram [66, 66, 47, 45, 45, 45, 33, 33, 33, 33, 33, 33, 33, 25, 22, 22, 22, 22, 22, 22, 22, 19, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:57,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:57,634 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:57,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:57,635 INFO L82 PathProgramCache]: Analyzing trace with hash 848822556, now seen corresponding path program 1 times [2020-07-21 13:11:57,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:57,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1833487289] [2020-07-21 13:11:57,637 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:58,147 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:58,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:58,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 1700 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:11:58,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:58,499 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1891 refuted. 0 times theorem prover too weak. 15332 trivial. 0 not checked. [2020-07-21 13:11:58,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:12:01,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:01,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:02,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:03,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:03,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:03,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:04,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:04,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:04,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:04,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:04,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:04,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:04,649 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1924 refuted. 0 times theorem prover too weak. 15299 trivial. 0 not checked. [2020-07-21 13:12:04,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1833487289] [2020-07-21 13:12:04,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:12:04,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:12:04,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715986026] [2020-07-21 13:12:04,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:12:04,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:12:04,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:12:04,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:12:04,652 INFO L87 Difference]: Start difference. First operand 77 states and 152 transitions. Second operand 21 states. [2020-07-21 13:12:05,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:12:05,169 INFO L93 Difference]: Finished difference Result 179 states and 673 transitions. [2020-07-21 13:12:05,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:12:05,170 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 765 [2020-07-21 13:12:05,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:12:05,177 INFO L225 Difference]: With dead ends: 179 [2020-07-21 13:12:05,177 INFO L226 Difference]: Without dead ends: 175 [2020-07-21 13:12:05,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1538 GetRequests, 1494 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:12:05,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2020-07-21 13:12:05,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 79. [2020-07-21 13:12:05,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-21 13:12:05,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 160 transitions. [2020-07-21 13:12:05,202 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 160 transitions. Word has length 765 [2020-07-21 13:12:05,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:12:05,202 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 160 transitions. [2020-07-21 13:12:05,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:12:05,203 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 160 transitions. [2020-07-21 13:12:05,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1080 [2020-07-21 13:12:05,216 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:12:05,217 INFO L422 BasicCegarLoop]: trace histogram [82, 82, 77, 77, 61, 57, 41, 41, 41, 41, 41, 41, 41, 38, 38, 38, 38, 38, 38, 38, 25, 20, 19, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:12:05,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:05,430 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:12:05,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:12:05,431 INFO L82 PathProgramCache]: Analyzing trace with hash 67032718, now seen corresponding path program 1 times [2020-07-21 13:12:05,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:12:05,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045472333] [2020-07-21 13:12:05,432 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:06,096 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:12:06,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:12:06,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 2400 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:12:06,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:12:06,776 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3056 refuted. 0 times theorem prover too weak. 30846 trivial. 0 not checked. [2020-07-21 13:12:06,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:12:10,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:13,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:13,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:14,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:14,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:15,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:15,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:15,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:15,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:15,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:15,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:15,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:15,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:15,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:15,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:15,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:16,465 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3096 refuted. 0 times theorem prover too weak. 30806 trivial. 0 not checked. [2020-07-21 13:12:16,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045472333] [2020-07-21 13:12:16,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:12:16,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:12:16,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566017449] [2020-07-21 13:12:16,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:12:16,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:12:16,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:12:16,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:12:16,468 INFO L87 Difference]: Start difference. First operand 79 states and 160 transitions. Second operand 23 states. [2020-07-21 13:12:17,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:12:17,130 INFO L93 Difference]: Finished difference Result 156 states and 522 transitions. [2020-07-21 13:12:17,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:12:17,134 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1079 [2020-07-21 13:12:17,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:12:17,139 INFO L225 Difference]: With dead ends: 156 [2020-07-21 13:12:17,140 INFO L226 Difference]: Without dead ends: 152 [2020-07-21 13:12:17,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2166 GetRequests, 2117 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:12:17,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-07-21 13:12:17,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 82. [2020-07-21 13:12:17,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-21 13:12:17,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 170 transitions. [2020-07-21 13:12:17,160 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 170 transitions. Word has length 1079 [2020-07-21 13:12:17,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:12:17,161 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 170 transitions. [2020-07-21 13:12:17,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:12:17,161 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 170 transitions. [2020-07-21 13:12:17,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 981 [2020-07-21 13:12:17,172 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:12:17,172 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 70, 70, 62, 53, 36, 36, 36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 35, 27, 17, 17, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:12:17,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:17,387 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:12:17,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:12:17,388 INFO L82 PathProgramCache]: Analyzing trace with hash -1973171480, now seen corresponding path program 2 times [2020-07-21 13:12:17,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:12:17,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449320883] [2020-07-21 13:12:17,389 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:18,024 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:12:18,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:12:18,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 2178 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:12:18,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:12:19,022 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2408 refuted. 0 times theorem prover too weak. 25350 trivial. 0 not checked. [2020-07-21 13:12:19,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:12:22,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:22,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:24,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:24,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:24,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:24,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:25,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:25,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:26,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:26,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:26,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:26,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:26,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:26,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:26,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:26,819 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2441 refuted. 0 times theorem prover too weak. 25317 trivial. 0 not checked. [2020-07-21 13:12:26,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449320883] [2020-07-21 13:12:26,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:12:26,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:12:26,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900110680] [2020-07-21 13:12:26,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:12:26,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:12:26,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:12:26,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:12:26,822 INFO L87 Difference]: Start difference. First operand 82 states and 170 transitions. Second operand 21 states. [2020-07-21 13:12:27,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:12:27,388 INFO L93 Difference]: Finished difference Result 174 states and 639 transitions. [2020-07-21 13:12:27,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:12:27,389 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 980 [2020-07-21 13:12:27,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:12:27,393 INFO L225 Difference]: With dead ends: 174 [2020-07-21 13:12:27,393 INFO L226 Difference]: Without dead ends: 170 [2020-07-21 13:12:27,394 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1967 GetRequests, 1923 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:12:27,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-07-21 13:12:27,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 89. [2020-07-21 13:12:27,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-21 13:12:27,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 197 transitions. [2020-07-21 13:12:27,415 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 197 transitions. Word has length 980 [2020-07-21 13:12:27,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:12:27,416 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 197 transitions. [2020-07-21 13:12:27,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:12:27,416 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 197 transitions. [2020-07-21 13:12:27,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-21 13:12:27,429 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:12:27,430 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 79, 79, 65, 60, 44, 44, 44, 44, 44, 44, 44, 39, 39, 39, 39, 39, 39, 39, 28, 21, 21, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:12:27,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:27,643 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:12:27,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:12:27,644 INFO L82 PathProgramCache]: Analyzing trace with hash -191683652, now seen corresponding path program 3 times [2020-07-21 13:12:27,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:12:27,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585123553] [2020-07-21 13:12:27,645 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:28,396 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:12:28,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:12:28,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 2522 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:12:28,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:12:29,085 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 764 proven. 3594 refuted. 0 times theorem prover too weak. 33876 trivial. 0 not checked. [2020-07-21 13:12:29,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:12:34,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:36,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:38,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:39,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:40,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:40,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:40,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:40,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:40,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:40,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:40,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:40,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:40,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:40,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:41,449 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 770 proven. 3644 refuted. 0 times theorem prover too weak. 33820 trivial. 0 not checked. [2020-07-21 13:12:41,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585123553] [2020-07-21 13:12:41,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:12:41,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 13:12:41,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330823196] [2020-07-21 13:12:41,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:12:41,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:12:41,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:12:41,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:12:41,451 INFO L87 Difference]: Start difference. First operand 89 states and 197 transitions. Second operand 25 states. [2020-07-21 13:12:42,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:12:42,440 INFO L93 Difference]: Finished difference Result 263 states and 1331 transitions. [2020-07-21 13:12:42,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:12:42,441 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1134 [2020-07-21 13:12:42,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:12:42,448 INFO L225 Difference]: With dead ends: 263 [2020-07-21 13:12:42,448 INFO L226 Difference]: Without dead ends: 142 [2020-07-21 13:12:42,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2277 GetRequests, 2223 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 13:12:42,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-07-21 13:12:42,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2020-07-21 13:12:42,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-21 13:12:42,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 326 transitions. [2020-07-21 13:12:42,480 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 326 transitions. Word has length 1134 [2020-07-21 13:12:42,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:12:42,481 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 326 transitions. [2020-07-21 13:12:42,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:12:42,481 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 326 transitions. [2020-07-21 13:12:42,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1001 [2020-07-21 13:12:42,494 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:12:42,494 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 63, 63, 58, 53, 42, 42, 42, 42, 42, 42, 42, 31, 31, 31, 31, 31, 31, 31, 31, 22, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:12:42,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:42,708 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:12:42,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:12:42,709 INFO L82 PathProgramCache]: Analyzing trace with hash 873446842, now seen corresponding path program 4 times [2020-07-21 13:12:42,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:12:42,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1715252827] [2020-07-21 13:12:42,710 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:43,412 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:12:43,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:12:43,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 2224 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:12:43,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:12:43,969 INFO L134 CoverageAnalysis]: Checked inductivity of 30091 backedges. 639 proven. 3181 refuted. 0 times theorem prover too weak. 26271 trivial. 0 not checked. [2020-07-21 13:12:43,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:12:49,018 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:12:49,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:49,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:52,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:52,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:53,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:54,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:54,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:54,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:54,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:55,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:55,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:55,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:55,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:55,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:55,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:55,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:55,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:56,217 INFO L134 CoverageAnalysis]: Checked inductivity of 30091 backedges. 643 proven. 3233 refuted. 0 times theorem prover too weak. 26215 trivial. 0 not checked. [2020-07-21 13:12:56,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1715252827] [2020-07-21 13:12:56,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:12:56,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 13:12:56,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177049587] [2020-07-21 13:12:56,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:12:56,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:12:56,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:12:56,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:12:56,221 INFO L87 Difference]: Start difference. First operand 142 states and 326 transitions. Second operand 25 states. [2020-07-21 13:12:57,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:12:57,540 INFO L93 Difference]: Finished difference Result 385 states and 1941 transitions. [2020-07-21 13:12:57,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:12:57,542 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1000 [2020-07-21 13:12:57,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:12:57,551 INFO L225 Difference]: With dead ends: 385 [2020-07-21 13:12:57,551 INFO L226 Difference]: Without dead ends: 198 [2020-07-21 13:12:57,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2009 GetRequests, 1955 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 13:12:57,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-21 13:12:57,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 147. [2020-07-21 13:12:57,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-21 13:12:57,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 346 transitions. [2020-07-21 13:12:57,594 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 346 transitions. Word has length 1000 [2020-07-21 13:12:57,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:12:57,595 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 346 transitions. [2020-07-21 13:12:57,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:12:57,595 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 346 transitions. [2020-07-21 13:12:57,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 982 [2020-07-21 13:12:57,616 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:12:57,617 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 70, 70, 53, 51, 37, 37, 37, 37, 37, 37, 37, 35, 35, 35, 35, 35, 35, 35, 22, 19, 18, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:12:57,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:57,831 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:12:57,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:12:57,832 INFO L82 PathProgramCache]: Analyzing trace with hash 401393431, now seen corresponding path program 5 times [2020-07-21 13:12:57,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:12:57,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1236758385] [2020-07-21 13:12:57,834 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:58,698 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:12:58,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:12:58,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 2183 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:12:58,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:12:59,423 INFO L134 CoverageAnalysis]: Checked inductivity of 28457 backedges. 601 proven. 2717 refuted. 0 times theorem prover too weak. 25139 trivial. 0 not checked. [2020-07-21 13:12:59,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:13:04,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:06,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:06,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:08,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:09,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:09,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:09,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:09,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:10,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:10,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:10,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:10,830 INFO L134 CoverageAnalysis]: Checked inductivity of 28457 backedges. 603 proven. 2755 refuted. 0 times theorem prover too weak. 25099 trivial. 0 not checked. [2020-07-21 13:13:10,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1236758385] [2020-07-21 13:13:10,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:13:10,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:13:10,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974758162] [2020-07-21 13:13:10,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:13:10,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:13:10,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:13:10,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:13:10,832 INFO L87 Difference]: Start difference. First operand 147 states and 346 transitions. Second operand 23 states. [2020-07-21 13:13:11,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:13:11,469 INFO L93 Difference]: Finished difference Result 263 states and 940 transitions. [2020-07-21 13:13:11,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:13:11,472 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 981 [2020-07-21 13:13:11,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:13:11,481 INFO L225 Difference]: With dead ends: 263 [2020-07-21 13:13:11,481 INFO L226 Difference]: Without dead ends: 249 [2020-07-21 13:13:11,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1970 GetRequests, 1921 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:13:11,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2020-07-21 13:13:11,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 150. [2020-07-21 13:13:11,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-21 13:13:11,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-21 13:13:11,521 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 981 [2020-07-21 13:13:11,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:13:11,522 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-21 13:13:11,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:13:11,522 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-21 13:13:11,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 935 [2020-07-21 13:13:11,536 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:13:11,537 INFO L422 BasicCegarLoop]: trace histogram [70, 70, 67, 67, 55, 50, 35, 35, 35, 35, 35, 35, 35, 33, 33, 33, 33, 33, 33, 33, 20, 20, 17, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:13:11,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:11,751 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:13:11,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:13:11,752 INFO L82 PathProgramCache]: Analyzing trace with hash 1939979877, now seen corresponding path program 6 times [2020-07-21 13:13:11,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:13:11,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2016321480] [2020-07-21 13:13:11,753 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:12,535 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:13:12,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:13:12,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 2077 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:13:12,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:13:12,980 INFO L134 CoverageAnalysis]: Checked inductivity of 25706 backedges. 511 proven. 2289 refuted. 0 times theorem prover too weak. 22906 trivial. 0 not checked. [2020-07-21 13:13:12,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:13:17,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:18,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:18,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:19,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:20,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:20,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:21,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:21,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:21,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:21,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:21,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:21,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:21,632 INFO L134 CoverageAnalysis]: Checked inductivity of 25706 backedges. 511 proven. 2319 refuted. 0 times theorem prover too weak. 22876 trivial. 0 not checked. [2020-07-21 13:13:21,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2016321480] [2020-07-21 13:13:21,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:13:21,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:13:21,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866961731] [2020-07-21 13:13:21,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:13:21,634 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:13:21,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:13:21,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:13:21,634 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-21 13:13:22,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:13:22,220 INFO L93 Difference]: Finished difference Result 299 states and 1198 transitions. [2020-07-21 13:13:22,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:13:22,221 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 934 [2020-07-21 13:13:22,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:13:22,229 INFO L225 Difference]: With dead ends: 299 [2020-07-21 13:13:22,229 INFO L226 Difference]: Without dead ends: 285 [2020-07-21 13:13:22,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1875 GetRequests, 1831 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:13:22,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2020-07-21 13:13:22,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 150. [2020-07-21 13:13:22,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-21 13:13:22,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-21 13:13:22,273 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 934 [2020-07-21 13:13:22,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:13:22,274 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-21 13:13:22,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:13:22,274 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-21 13:13:22,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1121 [2020-07-21 13:13:22,291 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:13:22,291 INFO L422 BasicCegarLoop]: trace histogram [86, 86, 77, 77, 69, 66, 43, 43, 43, 43, 43, 43, 43, 38, 38, 38, 38, 38, 38, 38, 28, 26, 20, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:13:22,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:22,505 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:13:22,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:13:22,506 INFO L82 PathProgramCache]: Analyzing trace with hash -1849137250, now seen corresponding path program 7 times [2020-07-21 13:13:22,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:13:22,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1012455779] [2020-07-21 13:13:22,507 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:23,413 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:13:23,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:13:23,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 2488 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:13:23,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:13:24,104 INFO L134 CoverageAnalysis]: Checked inductivity of 37239 backedges. 585 proven. 2878 refuted. 0 times theorem prover too weak. 33776 trivial. 0 not checked. [2020-07-21 13:13:24,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:13:30,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:30,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:31,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:32,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:32,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:33,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:33,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:33,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:33,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:33,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:33,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:33,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:33,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:34,562 INFO L134 CoverageAnalysis]: Checked inductivity of 37239 backedges. 587 proven. 2909 refuted. 0 times theorem prover too weak. 33743 trivial. 0 not checked. [2020-07-21 13:13:34,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1012455779] [2020-07-21 13:13:34,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:13:34,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:13:34,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809976317] [2020-07-21 13:13:34,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:13:34,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:13:34,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:13:34,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:13:34,564 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-21 13:13:35,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:13:35,241 INFO L93 Difference]: Finished difference Result 251 states and 812 transitions. [2020-07-21 13:13:35,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:13:35,243 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1120 [2020-07-21 13:13:35,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:13:35,249 INFO L225 Difference]: With dead ends: 251 [2020-07-21 13:13:35,250 INFO L226 Difference]: Without dead ends: 237 [2020-07-21 13:13:35,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2247 GetRequests, 2203 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:13:35,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2020-07-21 13:13:35,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 170. [2020-07-21 13:13:35,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-07-21 13:13:35,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 456 transitions. [2020-07-21 13:13:35,292 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 456 transitions. Word has length 1120 [2020-07-21 13:13:35,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:13:35,293 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 456 transitions. [2020-07-21 13:13:35,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:13:35,293 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 456 transitions. [2020-07-21 13:13:35,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1319 [2020-07-21 13:13:35,314 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:13:35,315 INFO L422 BasicCegarLoop]: trace histogram [103, 103, 92, 92, 72, 69, 51, 51, 51, 51, 51, 51, 51, 46, 46, 46, 46, 46, 46, 46, 31, 26, 23, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:13:35,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:35,530 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:13:35,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:13:35,531 INFO L82 PathProgramCache]: Analyzing trace with hash 1147462940, now seen corresponding path program 8 times [2020-07-21 13:13:35,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:13:35,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [697476456] [2020-07-21 13:13:35,532 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:36,446 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:13:36,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:13:36,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 2932 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:13:36,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:13:37,320 INFO L134 CoverageAnalysis]: Checked inductivity of 51898 backedges. 728 proven. 3822 refuted. 0 times theorem prover too weak. 47348 trivial. 0 not checked. [2020-07-21 13:13:37,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:13:45,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:47,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:47,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:49,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:50,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:50,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:51,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:51,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:51,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:51,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:52,331 INFO L134 CoverageAnalysis]: Checked inductivity of 51898 backedges. 730 proven. 3860 refuted. 0 times theorem prover too weak. 47308 trivial. 0 not checked. [2020-07-21 13:13:52,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [697476456] [2020-07-21 13:13:52,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:13:52,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:13:52,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817220397] [2020-07-21 13:13:52,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:13:52,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:13:52,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:13:52,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:13:52,334 INFO L87 Difference]: Start difference. First operand 170 states and 456 transitions. Second operand 23 states. [2020-07-21 13:13:53,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:13:53,102 INFO L93 Difference]: Finished difference Result 254 states and 839 transitions. [2020-07-21 13:13:53,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:13:53,104 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1318 [2020-07-21 13:13:53,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:13:53,110 INFO L225 Difference]: With dead ends: 254 [2020-07-21 13:13:53,110 INFO L226 Difference]: Without dead ends: 240 [2020-07-21 13:13:53,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2644 GetRequests, 2595 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:13:53,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2020-07-21 13:13:53,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 166. [2020-07-21 13:13:53,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-21 13:13:53,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 436 transitions. [2020-07-21 13:13:53,150 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 436 transitions. Word has length 1318 [2020-07-21 13:13:53,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:13:53,151 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 436 transitions. [2020-07-21 13:13:53,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:13:53,151 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 436 transitions. [2020-07-21 13:13:53,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1104 [2020-07-21 13:13:53,167 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:13:53,167 INFO L422 BasicCegarLoop]: trace histogram [82, 82, 79, 79, 65, 65, 41, 41, 41, 41, 41, 41, 41, 39, 39, 39, 39, 39, 39, 39, 26, 24, 17, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:13:53,380 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:53,381 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:13:53,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:13:53,381 INFO L82 PathProgramCache]: Analyzing trace with hash -462615337, now seen corresponding path program 9 times [2020-07-21 13:13:53,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:13:53,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944999149] [2020-07-21 13:13:53,382 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:54,277 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:13:54,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:13:54,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 2451 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:13:54,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:13:54,878 INFO L134 CoverageAnalysis]: Checked inductivity of 36012 backedges. 649 proven. 2690 refuted. 0 times theorem prover too weak. 32673 trivial. 0 not checked. [2020-07-21 13:13:54,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:14:01,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:03,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:03,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:04,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:05,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:05,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:05,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:05,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:05,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:05,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:06,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:06,789 INFO L134 CoverageAnalysis]: Checked inductivity of 36012 backedges. 649 proven. 2722 refuted. 0 times theorem prover too weak. 32641 trivial. 0 not checked. [2020-07-21 13:14:06,789 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944999149] [2020-07-21 13:14:06,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:14:06,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:14:06,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74344269] [2020-07-21 13:14:06,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:14:06,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:14:06,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:14:06,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:14:06,791 INFO L87 Difference]: Start difference. First operand 166 states and 436 transitions. Second operand 21 states. [2020-07-21 13:14:07,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:14:07,475 INFO L93 Difference]: Finished difference Result 269 states and 930 transitions. [2020-07-21 13:14:07,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:14:07,477 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1103 [2020-07-21 13:14:07,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:14:07,484 INFO L225 Difference]: With dead ends: 269 [2020-07-21 13:14:07,484 INFO L226 Difference]: Without dead ends: 255 [2020-07-21 13:14:07,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2213 GetRequests, 2169 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:14:07,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2020-07-21 13:14:07,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 160. [2020-07-21 13:14:07,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-21 13:14:07,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 409 transitions. [2020-07-21 13:14:07,522 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 409 transitions. Word has length 1103 [2020-07-21 13:14:07,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:14:07,523 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 409 transitions. [2020-07-21 13:14:07,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:14:07,523 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 409 transitions. [2020-07-21 13:14:07,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1641 [2020-07-21 13:14:07,552 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:14:07,553 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 106, 106, 103, 96, 66, 66, 66, 66, 66, 66, 66, 53, 53, 53, 53, 53, 53, 53, 50, 30, 30, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:14:07,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:07,767 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:14:07,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:14:07,767 INFO L82 PathProgramCache]: Analyzing trace with hash -515115330, now seen corresponding path program 10 times [2020-07-21 13:14:07,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:14:07,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1128821547] [2020-07-21 13:14:07,768 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:08,831 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:14:08,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:14:08,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 3642 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:14:08,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:14:09,903 INFO L134 CoverageAnalysis]: Checked inductivity of 81277 backedges. 853 proven. 3689 refuted. 0 times theorem prover too weak. 76735 trivial. 0 not checked. [2020-07-21 13:14:09,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:14:20,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:20,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:22,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:24,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:24,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:25,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:25,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:25,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:25,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:25,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:25,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:27,474 INFO L134 CoverageAnalysis]: Checked inductivity of 81277 backedges. 853 proven. 3713 refuted. 0 times theorem prover too weak. 76711 trivial. 0 not checked. [2020-07-21 13:14:27,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1128821547] [2020-07-21 13:14:27,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:14:27,476 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 13:14:27,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305669246] [2020-07-21 13:14:27,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:14:27,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:14:27,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:14:27,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:14:27,478 INFO L87 Difference]: Start difference. First operand 160 states and 409 transitions. Second operand 19 states. [2020-07-21 13:14:28,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:14:28,245 INFO L93 Difference]: Finished difference Result 324 states and 1425 transitions. [2020-07-21 13:14:28,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:14:28,247 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1640 [2020-07-21 13:14:28,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:14:28,263 INFO L225 Difference]: With dead ends: 324 [2020-07-21 13:14:28,264 INFO L226 Difference]: Without dead ends: 310 [2020-07-21 13:14:28,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3286 GetRequests, 3247 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:14:28,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2020-07-21 13:14:28,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 162. [2020-07-21 13:14:28,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-07-21 13:14:28,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 422 transitions. [2020-07-21 13:14:28,335 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 422 transitions. Word has length 1640 [2020-07-21 13:14:28,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:14:28,337 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 422 transitions. [2020-07-21 13:14:28,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:14:28,337 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 422 transitions. [2020-07-21 13:14:28,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1292 [2020-07-21 13:14:28,373 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:14:28,374 INFO L422 BasicCegarLoop]: trace histogram [100, 100, 89, 89, 76, 74, 50, 50, 50, 50, 50, 50, 50, 44, 44, 44, 44, 44, 44, 44, 32, 24, 24, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:14:28,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:28,589 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:14:28,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:14:28,589 INFO L82 PathProgramCache]: Analyzing trace with hash 395563217, now seen corresponding path program 11 times [2020-07-21 13:14:28,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:14:28,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407732808] [2020-07-21 13:14:28,590 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:29,605 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:14:29,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:14:29,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 2869 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:14:29,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:14:30,870 INFO L134 CoverageAnalysis]: Checked inductivity of 49699 backedges. 867 proven. 3152 refuted. 0 times theorem prover too weak. 45680 trivial. 0 not checked. [2020-07-21 13:14:30,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:14:37,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:37,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:39,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:41,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:42,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:42,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:42,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:42,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:42,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:42,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:42,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:44,236 INFO L134 CoverageAnalysis]: Checked inductivity of 49699 backedges. 869 proven. 3183 refuted. 0 times theorem prover too weak. 45647 trivial. 0 not checked. [2020-07-21 13:14:44,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407732808] [2020-07-21 13:14:44,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:14:44,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:14:44,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430869214] [2020-07-21 13:14:44,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:14:44,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:14:44,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:14:44,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:14:44,240 INFO L87 Difference]: Start difference. First operand 162 states and 422 transitions. Second operand 21 states. [2020-07-21 13:14:44,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:14:44,967 INFO L93 Difference]: Finished difference Result 263 states and 912 transitions. [2020-07-21 13:14:44,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:14:44,969 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1291 [2020-07-21 13:14:44,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:14:44,976 INFO L225 Difference]: With dead ends: 263 [2020-07-21 13:14:44,976 INFO L226 Difference]: Without dead ends: 246 [2020-07-21 13:14:44,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2589 GetRequests, 2545 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:14:44,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2020-07-21 13:14:45,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 182. [2020-07-21 13:14:45,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2020-07-21 13:14:45,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 527 transitions. [2020-07-21 13:14:45,019 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 527 transitions. Word has length 1291 [2020-07-21 13:14:45,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:14:45,020 INFO L479 AbstractCegarLoop]: Abstraction has 182 states and 527 transitions. [2020-07-21 13:14:45,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:14:45,020 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 527 transitions. [2020-07-21 13:14:45,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1205 [2020-07-21 13:14:45,046 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:14:45,046 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 84, 84, 64, 59, 47, 47, 47, 47, 47, 47, 47, 42, 42, 42, 42, 42, 42, 42, 36, 20, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:14:45,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:45,260 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:14:45,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:14:45,261 INFO L82 PathProgramCache]: Analyzing trace with hash 277522268, now seen corresponding path program 12 times [2020-07-21 13:14:45,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:14:45,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [513126090] [2020-07-21 13:14:45,262 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:46,481 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:14:46,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:14:46,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 2680 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:14:46,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:14:47,495 INFO L134 CoverageAnalysis]: Checked inductivity of 43299 backedges. 936 proven. 3198 refuted. 0 times theorem prover too weak. 39165 trivial. 0 not checked. [2020-07-21 13:14:47,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:14:53,858 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:14:54,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:57,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:59,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:59,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:59,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:00,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:00,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:00,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:00,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:00,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:00,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:00,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:00,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:02,150 INFO L134 CoverageAnalysis]: Checked inductivity of 43299 backedges. 940 proven. 3234 refuted. 0 times theorem prover too weak. 39125 trivial. 0 not checked. [2020-07-21 13:15:02,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [513126090] [2020-07-21 13:15:02,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:15:02,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:15:02,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181742754] [2020-07-21 13:15:02,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:15:02,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:15:02,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:15:02,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:15:02,154 INFO L87 Difference]: Start difference. First operand 182 states and 527 transitions. Second operand 23 states. [2020-07-21 13:15:03,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:15:03,045 INFO L93 Difference]: Finished difference Result 254 states and 844 transitions. [2020-07-21 13:15:03,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:15:03,047 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1204 [2020-07-21 13:15:03,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:15:03,054 INFO L225 Difference]: With dead ends: 254 [2020-07-21 13:15:03,054 INFO L226 Difference]: Without dead ends: 237 [2020-07-21 13:15:03,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2416 GetRequests, 2367 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:15:03,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2020-07-21 13:15:03,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 176. [2020-07-21 13:15:03,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 13:15:03,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 486 transitions. [2020-07-21 13:15:03,089 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 486 transitions. Word has length 1204 [2020-07-21 13:15:03,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:15:03,090 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 486 transitions. [2020-07-21 13:15:03,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:15:03,090 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 486 transitions. [2020-07-21 13:15:03,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1265 [2020-07-21 13:15:03,114 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:15:03,114 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 91, 91, 74, 73, 47, 47, 47, 47, 47, 47, 47, 45, 45, 45, 45, 45, 45, 45, 29, 26, 20, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:15:03,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:15:03,328 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:15:03,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:15:03,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1410579223, now seen corresponding path program 13 times [2020-07-21 13:15:03,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:15:03,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1565374313] [2020-07-21 13:15:03,329 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:15:04,455 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:15:04,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:15:04,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 2809 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:15:04,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:15:05,187 INFO L134 CoverageAnalysis]: Checked inductivity of 47477 backedges. 1176 proven. 3718 refuted. 0 times theorem prover too weak. 42583 trivial. 0 not checked. [2020-07-21 13:15:05,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:15:06,532 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:15:15,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:15,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:19,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:23,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:24,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:25,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:26,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:26,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:26,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:27,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:27,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:27,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:27,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:28,962 INFO L134 CoverageAnalysis]: Checked inductivity of 47477 backedges. 1178 proven. 3772 refuted. 0 times theorem prover too weak. 42527 trivial. 0 not checked. [2020-07-21 13:15:28,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1565374313] [2020-07-21 13:15:28,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:15:28,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 13:15:28,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17561143] [2020-07-21 13:15:28,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:15:28,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:15:28,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:15:28,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:15:28,964 INFO L87 Difference]: Start difference. First operand 176 states and 486 transitions. Second operand 25 states. [2020-07-21 13:15:30,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:15:30,616 INFO L93 Difference]: Finished difference Result 276 states and 960 transitions. [2020-07-21 13:15:30,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:15:30,620 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1264 [2020-07-21 13:15:30,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:15:30,626 INFO L225 Difference]: With dead ends: 276 [2020-07-21 13:15:30,626 INFO L226 Difference]: Without dead ends: 230 [2020-07-21 13:15:30,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2537 GetRequests, 2483 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 13:15:30,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2020-07-21 13:15:30,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 224. [2020-07-21 13:15:30,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 13:15:30,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 667 transitions. [2020-07-21 13:15:30,663 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 667 transitions. Word has length 1264 [2020-07-21 13:15:30,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:15:30,664 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 667 transitions. [2020-07-21 13:15:30,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:15:30,664 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 667 transitions. [2020-07-21 13:15:30,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 949 [2020-07-21 13:15:30,682 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:15:30,683 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 68, 68, 54, 53, 35, 35, 35, 35, 35, 35, 35, 34, 34, 34, 34, 34, 34, 34, 20, 18, 17, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:15:30,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:15:30,897 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:15:30,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:15:30,897 INFO L82 PathProgramCache]: Analyzing trace with hash 255881248, now seen corresponding path program 14 times [2020-07-21 13:15:30,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:15:30,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568790500] [2020-07-21 13:15:30,898 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:15:31,916 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:15:31,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:15:31,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 2108 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:15:31,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:15:32,479 INFO L134 CoverageAnalysis]: Checked inductivity of 26485 backedges. 602 proven. 2235 refuted. 0 times theorem prover too weak. 23648 trivial. 0 not checked. [2020-07-21 13:15:32,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:15:40,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:40,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:44,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:44,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:45,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:45,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:46,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:47,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:47,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:47,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:47,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:47,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:47,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:15:48,394 INFO L134 CoverageAnalysis]: Checked inductivity of 26485 backedges. 604 proven. 2263 refuted. 0 times theorem prover too weak. 23618 trivial. 0 not checked. [2020-07-21 13:15:48,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568790500] [2020-07-21 13:15:48,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:15:48,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:15:48,395 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826047138] [2020-07-21 13:15:48,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:15:48,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:15:48,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:15:48,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:15:48,397 INFO L87 Difference]: Start difference. First operand 224 states and 667 transitions. Second operand 21 states. [2020-07-21 13:15:49,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:15:49,338 INFO L93 Difference]: Finished difference Result 342 states and 1296 transitions. [2020-07-21 13:15:49,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:15:49,342 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 948 [2020-07-21 13:15:49,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:15:49,349 INFO L225 Difference]: With dead ends: 342 [2020-07-21 13:15:49,350 INFO L226 Difference]: Without dead ends: 328 [2020-07-21 13:15:49,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1903 GetRequests, 1859 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:15:49,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-07-21 13:15:49,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 225. [2020-07-21 13:15:49,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2020-07-21 13:15:49,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 667 transitions. [2020-07-21 13:15:49,395 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 667 transitions. Word has length 948 [2020-07-21 13:15:49,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:15:49,396 INFO L479 AbstractCegarLoop]: Abstraction has 225 states and 667 transitions. [2020-07-21 13:15:49,396 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:15:49,396 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 667 transitions. [2020-07-21 13:15:49,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1281 [2020-07-21 13:15:49,419 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:15:49,419 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 93, 93, 79, 72, 47, 47, 47, 47, 47, 47, 47, 46, 46, 46, 46, 46, 46, 46, 32, 26, 22, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:15:49,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:15:49,635 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:15:49,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:15:49,636 INFO L82 PathProgramCache]: Analyzing trace with hash 239019294, now seen corresponding path program 15 times [2020-07-21 13:15:49,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:15:49,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [375697388] [2020-07-21 13:15:49,637 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:15:50,866 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:15:50,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:15:50,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 2844 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:15:50,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:15:51,659 INFO L134 CoverageAnalysis]: Checked inductivity of 48697 backedges. 788 proven. 3122 refuted. 0 times theorem prover too weak. 44787 trivial. 0 not checked. [2020-07-21 13:15:51,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:16:04,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:04,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:08,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:10,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:11,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:11,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:11,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:11,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:11,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:11,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:12,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:12,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:14,119 INFO L134 CoverageAnalysis]: Checked inductivity of 48697 backedges. 790 proven. 3150 refuted. 0 times theorem prover too weak. 44757 trivial. 0 not checked. [2020-07-21 13:16:14,119 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [375697388] [2020-07-21 13:16:14,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:16:14,120 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:16:14,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305927635] [2020-07-21 13:16:14,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:16:14,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:16:14,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:16:14,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:16:14,122 INFO L87 Difference]: Start difference. First operand 225 states and 667 transitions. Second operand 21 states. [2020-07-21 13:16:15,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:16:15,221 INFO L93 Difference]: Finished difference Result 371 states and 1497 transitions. [2020-07-21 13:16:15,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:16:15,226 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1280 [2020-07-21 13:16:15,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:16:15,235 INFO L225 Difference]: With dead ends: 371 [2020-07-21 13:16:15,236 INFO L226 Difference]: Without dead ends: 354 [2020-07-21 13:16:15,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2567 GetRequests, 2523 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:16:15,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2020-07-21 13:16:15,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 215. [2020-07-21 13:16:15,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-07-21 13:16:15,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 602 transitions. [2020-07-21 13:16:15,290 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 602 transitions. Word has length 1280 [2020-07-21 13:16:15,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:16:15,291 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 602 transitions. [2020-07-21 13:16:15,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:16:15,291 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 602 transitions. [2020-07-21 13:16:15,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 970 [2020-07-21 13:16:15,308 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:16:15,309 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 68, 68, 59, 57, 36, 36, 36, 36, 36, 36, 36, 34, 34, 34, 34, 34, 34, 34, 25, 21, 14, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:16:15,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:16:15,523 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:16:15,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:16:15,524 INFO L82 PathProgramCache]: Analyzing trace with hash 1691446135, now seen corresponding path program 16 times [2020-07-21 13:16:15,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:16:15,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [923019407] [2020-07-21 13:16:15,525 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:16:16,618 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:16:16,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:16:16,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 2153 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:16:16,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:16:17,172 INFO L134 CoverageAnalysis]: Checked inductivity of 27695 backedges. 681 proven. 1916 refuted. 0 times theorem prover too weak. 25098 trivial. 0 not checked. [2020-07-21 13:16:17,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:16:26,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:29,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:32,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:32,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:32,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:33,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:33,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:33,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:33,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:33,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:33,958 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 13:16:35,328 INFO L134 CoverageAnalysis]: Checked inductivity of 27695 backedges. 681 proven. 1942 refuted. 0 times theorem prover too weak. 25072 trivial. 0 not checked. [2020-07-21 13:16:35,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [923019407] [2020-07-21 13:16:35,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:16:35,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 13:16:35,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895923423] [2020-07-21 13:16:35,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:16:35,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:16:35,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:16:35,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:16:35,331 INFO L87 Difference]: Start difference. First operand 215 states and 602 transitions. Second operand 19 states. [2020-07-21 13:16:36,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:16:36,305 INFO L93 Difference]: Finished difference Result 469 states and 2379 transitions. [2020-07-21 13:16:36,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:16:36,308 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 969 [2020-07-21 13:16:36,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:16:36,324 INFO L225 Difference]: With dead ends: 469 [2020-07-21 13:16:36,324 INFO L226 Difference]: Without dead ends: 452 [2020-07-21 13:16:36,330 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1944 GetRequests, 1905 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:16:36,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2020-07-21 13:16:36,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 217. [2020-07-21 13:16:36,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2020-07-21 13:16:36,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 616 transitions. [2020-07-21 13:16:36,398 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 616 transitions. Word has length 969 [2020-07-21 13:16:36,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:16:36,399 INFO L479 AbstractCegarLoop]: Abstraction has 217 states and 616 transitions. [2020-07-21 13:16:36,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:16:36,400 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 616 transitions. [2020-07-21 13:16:36,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1252 [2020-07-21 13:16:36,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:16:36,423 INFO L422 BasicCegarLoop]: trace histogram [93, 93, 90, 90, 76, 70, 46, 46, 46, 46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 45, 30, 25, 23, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:16:36,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:16:36,636 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:16:36,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:16:36,637 INFO L82 PathProgramCache]: Analyzing trace with hash 473075186, now seen corresponding path program 17 times [2020-07-21 13:16:36,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:16:36,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1311477817] [2020-07-21 13:16:36,638 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:16:37,807 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:16:37,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:16:37,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 2780 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:16:37,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:16:38,691 INFO L134 CoverageAnalysis]: Checked inductivity of 46497 backedges. 919 proven. 3914 refuted. 0 times theorem prover too weak. 41664 trivial. 0 not checked. [2020-07-21 13:16:38,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:16:49,645 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:16:50,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:50,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:54,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:54,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:59,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:01,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:01,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:02,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:02,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:02,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:03,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:03,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:03,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:03,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:03,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:03,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:05,425 INFO L134 CoverageAnalysis]: Checked inductivity of 46497 backedges. 929 proven. 3962 refuted. 0 times theorem prover too weak. 41606 trivial. 0 not checked. [2020-07-21 13:17:05,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1311477817] [2020-07-21 13:17:05,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:17:05,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 26 [2020-07-21 13:17:05,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531155280] [2020-07-21 13:17:05,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 13:17:05,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:17:05,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 13:17:05,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=540, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:17:05,430 INFO L87 Difference]: Start difference. First operand 217 states and 616 transitions. Second operand 26 states. [2020-07-21 13:17:07,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:17:07,268 INFO L93 Difference]: Finished difference Result 429 states and 1745 transitions. [2020-07-21 13:17:07,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:17:07,273 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 1251 [2020-07-21 13:17:07,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:17:07,285 INFO L225 Difference]: With dead ends: 429 [2020-07-21 13:17:07,285 INFO L226 Difference]: Without dead ends: 368 [2020-07-21 13:17:07,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2511 GetRequests, 2457 SyntacticMatches, 20 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=240, Invalid=1020, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 13:17:07,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2020-07-21 13:17:07,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 291. [2020-07-21 13:17:07,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 291 states. [2020-07-21 13:17:07,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 1033 transitions. [2020-07-21 13:17:07,360 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 1033 transitions. Word has length 1251 [2020-07-21 13:17:07,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:17:07,361 INFO L479 AbstractCegarLoop]: Abstraction has 291 states and 1033 transitions. [2020-07-21 13:17:07,361 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 13:17:07,361 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 1033 transitions. [2020-07-21 13:17:07,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1046 [2020-07-21 13:17:07,389 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:17:07,390 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 75, 75, 72, 60, 38, 38, 38, 38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 37, 35, 22, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:17:07,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:17:07,604 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:17:07,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:17:07,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1614931594, now seen corresponding path program 18 times [2020-07-21 13:17:07,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:17:07,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127901104] [2020-07-21 13:17:07,606 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:17:08,980 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:17:08,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:17:08,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 2320 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:17:09,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:17:09,739 INFO L134 CoverageAnalysis]: Checked inductivity of 32302 backedges. 767 proven. 2446 refuted. 0 times theorem prover too weak. 29089 trivial. 0 not checked. [2020-07-21 13:17:09,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:17:18,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:18,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:21,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:21,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:25,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:25,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:27,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:27,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:27,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:28,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:28,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:28,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:28,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:28,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:28,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:29,840 INFO L134 CoverageAnalysis]: Checked inductivity of 32302 backedges. 779 proven. 2469 refuted. 0 times theorem prover too weak. 29054 trivial. 0 not checked. [2020-07-21 13:17:29,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127901104] [2020-07-21 13:17:29,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:17:29,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:17:29,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162085618] [2020-07-21 13:17:29,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:17:29,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:17:29,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:17:29,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:17:29,844 INFO L87 Difference]: Start difference. First operand 291 states and 1033 transitions. Second operand 21 states. [2020-07-21 13:17:31,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:17:31,253 INFO L93 Difference]: Finished difference Result 446 states and 2010 transitions. [2020-07-21 13:17:31,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:17:31,257 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1045 [2020-07-21 13:17:31,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:17:31,270 INFO L225 Difference]: With dead ends: 446 [2020-07-21 13:17:31,270 INFO L226 Difference]: Without dead ends: 373 [2020-07-21 13:17:31,277 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2097 GetRequests, 2053 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:17:31,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 373 states. [2020-07-21 13:17:31,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 373 to 300. [2020-07-21 13:17:31,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-21 13:17:31,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 1031 transitions. [2020-07-21 13:17:31,332 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 1031 transitions. Word has length 1045 [2020-07-21 13:17:31,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:17:31,332 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 1031 transitions. [2020-07-21 13:17:31,332 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:17:31,332 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 1031 transitions. [2020-07-21 13:17:31,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1346 [2020-07-21 13:17:31,358 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:17:31,359 INFO L422 BasicCegarLoop]: trace histogram [103, 103, 94, 94, 78, 78, 51, 51, 51, 51, 51, 51, 51, 47, 47, 47, 47, 47, 47, 47, 31, 27, 25, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:17:31,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:17:31,560 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:17:31,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:17:31,562 INFO L82 PathProgramCache]: Analyzing trace with hash -1962123897, now seen corresponding path program 19 times [2020-07-21 13:17:31,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:17:31,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1211303428] [2020-07-21 13:17:31,563 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:17:33,001 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:17:33,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:17:33,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 2989 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:17:33,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:17:34,074 INFO L134 CoverageAnalysis]: Checked inductivity of 53926 backedges. 864 proven. 3855 refuted. 0 times theorem prover too weak. 49207 trivial. 0 not checked. [2020-07-21 13:17:34,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:17:37,228 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:17:38,946 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:17:39,057 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:17:39,172 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:17:39,287 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:17:39,399 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 13:17:39,507 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 13:17:52,588 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:17:52,691 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:17:52,803 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:17:52,915 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:17:53,022 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 13:17:53,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:58,016 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:17:59,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:59,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:02,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:05,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:06,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:06,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:06,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:06,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:07,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:07,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:07,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:07,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:09,112 INFO L134 CoverageAnalysis]: Checked inductivity of 53926 backedges. 872 proven. 3891 refuted. 0 times theorem prover too weak. 49163 trivial. 0 not checked. [2020-07-21 13:18:09,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1211303428] [2020-07-21 13:18:09,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:09,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:18:09,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1894590689] [2020-07-21 13:18:09,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:18:09,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:09,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:18:09,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:18:09,116 INFO L87 Difference]: Start difference. First operand 300 states and 1031 transitions. Second operand 23 states. [2020-07-21 13:18:10,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:10,972 INFO L93 Difference]: Finished difference Result 472 states and 1984 transitions. [2020-07-21 13:18:10,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:18:10,977 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1345 [2020-07-21 13:18:10,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:10,988 INFO L225 Difference]: With dead ends: 472 [2020-07-21 13:18:10,988 INFO L226 Difference]: Without dead ends: 399 [2020-07-21 13:18:10,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2698 GetRequests, 2649 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:18:10,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2020-07-21 13:18:11,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 320. [2020-07-21 13:18:11,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 320 states. [2020-07-21 13:18:11,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 1119 transitions. [2020-07-21 13:18:11,059 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 1119 transitions. Word has length 1345 [2020-07-21 13:18:11,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:11,059 INFO L479 AbstractCegarLoop]: Abstraction has 320 states and 1119 transitions. [2020-07-21 13:18:11,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:18:11,060 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 1119 transitions. [2020-07-21 13:18:11,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1009 [2020-07-21 13:18:11,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:11,080 INFO L422 BasicCegarLoop]: trace histogram [78, 78, 69, 69, 62, 57, 39, 39, 39, 39, 39, 39, 39, 34, 34, 34, 34, 34, 34, 34, 28, 18, 16, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:18:11,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:11,281 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:11,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:11,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1850918110, now seen corresponding path program 20 times [2020-07-21 13:18:11,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:11,283 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [80728202] [2020-07-21 13:18:11,283 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:12,519 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:12,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:12,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 2240 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:18:12,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:13,204 INFO L134 CoverageAnalysis]: Checked inductivity of 30091 backedges. 827 proven. 2266 refuted. 0 times theorem prover too weak. 26998 trivial. 0 not checked. [2020-07-21 13:18:13,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:17,221 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:18:17,327 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:18:17,437 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:18:17,548 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:18:17,661 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 13:18:26,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:28,273 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 13:18:31,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:34,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:34,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:34,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:35,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:35,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:36,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:36,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:36,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:36,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:36,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:36,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:37,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:38,798 INFO L134 CoverageAnalysis]: Checked inductivity of 30091 backedges. 837 proven. 2291 refuted. 0 times theorem prover too weak. 26963 trivial. 0 not checked. [2020-07-21 13:18:38,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [80728202] [2020-07-21 13:18:38,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:38,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:18:38,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924077816] [2020-07-21 13:18:38,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:18:38,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:38,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:18:38,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:18:38,801 INFO L87 Difference]: Start difference. First operand 320 states and 1119 transitions. Second operand 21 states. [2020-07-21 13:18:40,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:40,456 INFO L93 Difference]: Finished difference Result 476 states and 2059 transitions. [2020-07-21 13:18:40,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:18:40,464 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1008 [2020-07-21 13:18:40,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:40,485 INFO L225 Difference]: With dead ends: 476 [2020-07-21 13:18:40,485 INFO L226 Difference]: Without dead ends: 433 [2020-07-21 13:18:40,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2023 GetRequests, 1979 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:18:40,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2020-07-21 13:18:40,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 317. [2020-07-21 13:18:40,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2020-07-21 13:18:40,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 1110 transitions. [2020-07-21 13:18:40,593 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 1110 transitions. Word has length 1008 [2020-07-21 13:18:40,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:40,594 INFO L479 AbstractCegarLoop]: Abstraction has 317 states and 1110 transitions. [2020-07-21 13:18:40,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:18:40,594 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 1110 transitions. [2020-07-21 13:18:40,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1099 [2020-07-21 13:18:40,631 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:40,632 INFO L422 BasicCegarLoop]: trace histogram [82, 82, 79, 79, 63, 62, 41, 41, 41, 41, 41, 41, 41, 39, 39, 39, 39, 39, 39, 39, 24, 21, 19, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:18:40,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:40,847 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:40,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:40,848 INFO L82 PathProgramCache]: Analyzing trace with hash -975130805, now seen corresponding path program 21 times [2020-07-21 13:18:40,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:40,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [468354792] [2020-07-21 13:18:40,848 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:42,324 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:42,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:42,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 2441 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:18:42,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:43,295 INFO L134 CoverageAnalysis]: Checked inductivity of 35696 backedges. 838 proven. 3370 refuted. 0 times theorem prover too weak. 31488 trivial. 0 not checked. [2020-07-21 13:18:43,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:46,301 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:18:46,407 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:18:46,991 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:18:47,098 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:18:47,214 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:18:47,330 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:18:48,508 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 13:18:48,639 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 13:18:48,779 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 13:18:48,920 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 13:18:49,060 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 13:18:49,189 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 13:18:49,311 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 13:18:49,426 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 13:18:49,535 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 13:18:49,638 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 13:18:58,563 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:18:59,211 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:18:59,318 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:18:59,423 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:18:59,533 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:19:00,207 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:19:00,333 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:19:00,466 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:19:00,593 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:19:00,715 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 13:19:00,830 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 13:19:00,938 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 13:19:01,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:06,332 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:19:06,437 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:19:07,007 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:19:07,123 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:19:07,244 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:19:07,365 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:19:07,482 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 13:19:07,590 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 13:19:08,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:12,284 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:19:12,391 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:19:12,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:15,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:16,501 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2020-07-21 13:19:17,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:17,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:18,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:19,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:19,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:19,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:19,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:19,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:20,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:21,310 INFO L134 CoverageAnalysis]: Checked inductivity of 35696 backedges. 842 proven. 3422 refuted. 0 times theorem prover too weak. 31432 trivial. 0 not checked. [2020-07-21 13:19:21,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [468354792] [2020-07-21 13:19:21,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:21,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 13:19:21,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347770834] [2020-07-21 13:19:21,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:19:21,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:21,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:19:21,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:19:21,314 INFO L87 Difference]: Start difference. First operand 317 states and 1110 transitions. Second operand 25 states. [2020-07-21 13:19:23,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:23,234 INFO L93 Difference]: Finished difference Result 412 states and 1541 transitions. [2020-07-21 13:19:23,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:19:23,239 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1098 [2020-07-21 13:19:23,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:23,248 INFO L225 Difference]: With dead ends: 412 [2020-07-21 13:19:23,248 INFO L226 Difference]: Without dead ends: 351 [2020-07-21 13:19:23,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2205 GetRequests, 2151 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 13:19:23,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-21 13:19:23,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 245. [2020-07-21 13:19:23,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2020-07-21 13:19:23,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 675 transitions. [2020-07-21 13:19:23,298 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 675 transitions. Word has length 1098 [2020-07-21 13:19:23,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:23,299 INFO L479 AbstractCegarLoop]: Abstraction has 245 states and 675 transitions. [2020-07-21 13:19:23,299 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:19:23,299 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 675 transitions. [2020-07-21 13:19:23,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1054 [2020-07-21 13:19:23,317 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:23,317 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 71, 71, 60, 56, 42, 42, 42, 42, 42, 42, 42, 35, 35, 35, 35, 35, 35, 35, 25, 24, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:23,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:23,518 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:23,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:23,519 INFO L82 PathProgramCache]: Analyzing trace with hash -526904642, now seen corresponding path program 22 times [2020-07-21 13:19:23,520 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:23,520 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [311129016] [2020-07-21 13:19:23,520 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:24,979 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:24,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:24,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 2342 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:19:25,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:25,976 INFO L134 CoverageAnalysis]: Checked inductivity of 33018 backedges. 787 proven. 2397 refuted. 0 times theorem prover too weak. 29834 trivial. 0 not checked. [2020-07-21 13:19:25,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:29,843 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:19:29,947 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:19:37,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:37,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:42,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:45,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:46,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:46,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:47,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:47,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:47,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:47,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:47,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:49,419 INFO L134 CoverageAnalysis]: Checked inductivity of 33018 backedges. 787 proven. 2429 refuted. 0 times theorem prover too weak. 29802 trivial. 0 not checked. [2020-07-21 13:19:49,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [311129016] [2020-07-21 13:19:49,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:49,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:19:49,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420559548] [2020-07-21 13:19:49,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:19:49,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:49,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:19:49,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:19:49,422 INFO L87 Difference]: Start difference. First operand 245 states and 675 transitions. Second operand 21 states. [2020-07-21 13:19:50,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:50,518 INFO L93 Difference]: Finished difference Result 359 states and 1247 transitions. [2020-07-21 13:19:50,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:19:50,521 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1053 [2020-07-21 13:19:50,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:50,529 INFO L225 Difference]: With dead ends: 359 [2020-07-21 13:19:50,529 INFO L226 Difference]: Without dead ends: 342 [2020-07-21 13:19:50,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2113 GetRequests, 2069 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:19:50,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-07-21 13:19:50,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 234. [2020-07-21 13:19:50,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2020-07-21 13:19:50,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 624 transitions. [2020-07-21 13:19:50,574 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 624 transitions. Word has length 1053 [2020-07-21 13:19:50,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:50,574 INFO L479 AbstractCegarLoop]: Abstraction has 234 states and 624 transitions. [2020-07-21 13:19:50,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:19:50,575 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 624 transitions. [2020-07-21 13:19:50,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 996 [2020-07-21 13:19:50,588 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:50,588 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 69, 69, 59, 59, 38, 38, 38, 38, 38, 38, 38, 34, 34, 34, 34, 34, 34, 34, 25, 21, 17, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:50,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:50,789 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:50,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:50,791 INFO L82 PathProgramCache]: Analyzing trace with hash 522928899, now seen corresponding path program 23 times [2020-07-21 13:19:50,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:50,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [399031933] [2020-07-21 13:19:50,792 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:52,134 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:52,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:52,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 2211 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:19:52,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:53,741 INFO L134 CoverageAnalysis]: Checked inductivity of 29262 backedges. 1031 proven. 2020 refuted. 0 times theorem prover too weak. 26211 trivial. 0 not checked. [2020-07-21 13:19:53,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:57,261 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:19:57,365 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:19:57,469 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 13:20:04,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:09,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:10,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:11,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:12,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:12,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:12,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:12,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:13,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:16,234 INFO L134 CoverageAnalysis]: Checked inductivity of 29262 backedges. 1035 proven. 2049 refuted. 0 times theorem prover too weak. 26178 trivial. 0 not checked. [2020-07-21 13:20:16,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [399031933] [2020-07-21 13:20:16,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:20:16,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:20:16,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659511829] [2020-07-21 13:20:16,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:20:16,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:20:16,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:20:16,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:20:16,239 INFO L87 Difference]: Start difference. First operand 234 states and 624 transitions. Second operand 21 states. [2020-07-21 13:20:17,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:20:17,341 INFO L93 Difference]: Finished difference Result 357 states and 1256 transitions. [2020-07-21 13:20:17,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:20:17,345 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 995 [2020-07-21 13:20:17,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:20:17,353 INFO L225 Difference]: With dead ends: 357 [2020-07-21 13:20:17,354 INFO L226 Difference]: Without dead ends: 348 [2020-07-21 13:20:17,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1997 GetRequests, 1953 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:20:17,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2020-07-21 13:20:17,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 281. [2020-07-21 13:20:17,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 281 states. [2020-07-21 13:20:17,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 860 transitions. [2020-07-21 13:20:17,400 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 860 transitions. Word has length 995 [2020-07-21 13:20:17,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:20:17,401 INFO L479 AbstractCegarLoop]: Abstraction has 281 states and 860 transitions. [2020-07-21 13:20:17,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:20:17,401 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 860 transitions. [2020-07-21 13:20:17,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1559 [2020-07-21 13:20:17,430 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:20:17,431 INFO L422 BasicCegarLoop]: trace histogram [121, 121, 110, 110, 86, 79, 60, 60, 60, 60, 60, 60, 60, 55, 55, 55, 55, 55, 55, 55, 42, 26, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:20:17,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:17,646 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:20:17,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:20:17,647 INFO L82 PathProgramCache]: Analyzing trace with hash 1760478706, now seen corresponding path program 24 times [2020-07-21 13:20:17,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:20:17,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1167978228] [2020-07-21 13:20:17,648 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:19,205 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:20:19,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:20:19,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 3466 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:20:19,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:20:20,280 INFO L134 CoverageAnalysis]: Checked inductivity of 72776 backedges. 952 proven. 3308 refuted. 0 times theorem prover too weak. 68516 trivial. 0 not checked. [2020-07-21 13:20:20,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:20:24,618 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:20:42,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:48,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:52,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:52,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:53,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:53,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:53,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:53,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:53,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:54,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:55,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:58,502 INFO L134 CoverageAnalysis]: Checked inductivity of 72776 backedges. 954 proven. 3330 refuted. 0 times theorem prover too weak. 68492 trivial. 0 not checked. [2020-07-21 13:20:58,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1167978228] [2020-07-21 13:20:58,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:20:58,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 13:20:58,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480010853] [2020-07-21 13:20:58,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:20:58,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:20:58,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:20:58,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:20:58,506 INFO L87 Difference]: Start difference. First operand 281 states and 860 transitions. Second operand 19 states. [2020-07-21 13:20:59,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:20:59,984 INFO L93 Difference]: Finished difference Result 472 states and 2073 transitions. [2020-07-21 13:20:59,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:20:59,991 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1558 [2020-07-21 13:20:59,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:21:00,007 INFO L225 Difference]: With dead ends: 472 [2020-07-21 13:21:00,007 INFO L226 Difference]: Without dead ends: 454 [2020-07-21 13:21:00,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3122 GetRequests, 3083 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:21:00,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2020-07-21 13:21:00,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 297. [2020-07-21 13:21:00,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 297 states. [2020-07-21 13:21:00,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 933 transitions. [2020-07-21 13:21:00,078 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 933 transitions. Word has length 1558 [2020-07-21 13:21:00,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:21:00,079 INFO L479 AbstractCegarLoop]: Abstraction has 297 states and 933 transitions. [2020-07-21 13:21:00,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:21:00,079 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 933 transitions. [2020-07-21 13:21:00,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1093 [2020-07-21 13:21:00,109 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:21:00,110 INFO L422 BasicCegarLoop]: trace histogram [81, 81, 80, 80, 62, 57, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 24, 22, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:21:00,323 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:21:00,324 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:21:00,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:21:00,325 INFO L82 PathProgramCache]: Analyzing trace with hash 1337724085, now seen corresponding path program 25 times [2020-07-21 13:21:00,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:21:00,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1194679566] [2020-07-21 13:21:00,326 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:21:01,946 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:21:01,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:21:01,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 2429 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:21:01,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:21:03,272 INFO L134 CoverageAnalysis]: Checked inductivity of 35327 backedges. 994 proven. 2768 refuted. 0 times theorem prover too weak. 31565 trivial. 0 not checked. [2020-07-21 13:21:03,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:21:05,923 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:21:06,032 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:21:06,151 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:21:06,271 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:21:07,028 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:21:07,146 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:21:07,275 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:21:07,401 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:21:08,140 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 13:21:08,790 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:21:08,923 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:21:09,068 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:21:09,207 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:21:09,346 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 13:21:09,475 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 13:21:09,599 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 13:21:09,713 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 13:21:09,818 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:21:18,538 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:21:18,645 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:21:18,763 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:21:18,876 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:21:19,604 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:21:19,726 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:21:19,855 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:21:19,981 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:21:20,108 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 13:21:20,235 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 13:21:20,340 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:21:20,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:20,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:26,190 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:21:26,301 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:21:26,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:30,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:30,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:31,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:32,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:32,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:32,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:32,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:33,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:33,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:33,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:33,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:34,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:35,807 INFO L134 CoverageAnalysis]: Checked inductivity of 35327 backedges. 998 proven. 2810 refuted. 0 times theorem prover too weak. 31519 trivial. 0 not checked. [2020-07-21 13:21:35,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1194679566] [2020-07-21 13:21:35,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:21:35,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:21:35,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214466951] [2020-07-21 13:21:35,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:21:35,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:21:35,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:21:35,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:21:35,810 INFO L87 Difference]: Start difference. First operand 297 states and 933 transitions. Second operand 23 states. [2020-07-21 13:21:37,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:21:37,631 INFO L93 Difference]: Finished difference Result 483 states and 1999 transitions. [2020-07-21 13:21:37,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:21:37,636 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1092 [2020-07-21 13:21:37,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:21:37,647 INFO L225 Difference]: With dead ends: 483 [2020-07-21 13:21:37,648 INFO L226 Difference]: Without dead ends: 437 [2020-07-21 13:21:37,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2192 GetRequests, 2143 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:21:37,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2020-07-21 13:21:37,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 276. [2020-07-21 13:21:37,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 276 states. [2020-07-21 13:21:37,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 872 transitions. [2020-07-21 13:21:37,696 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 872 transitions. Word has length 1092 [2020-07-21 13:21:37,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:21:37,696 INFO L479 AbstractCegarLoop]: Abstraction has 276 states and 872 transitions. [2020-07-21 13:21:37,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:21:37,697 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 872 transitions. [2020-07-21 13:21:37,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1256 [2020-07-21 13:21:37,712 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:21:37,713 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 92, 92, 64, 62, 47, 47, 47, 47, 47, 47, 47, 46, 46, 46, 46, 46, 46, 46, 33, 28, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:21:37,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:21:37,914 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:21:37,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:21:37,915 INFO L82 PathProgramCache]: Analyzing trace with hash -897594852, now seen corresponding path program 26 times [2020-07-21 13:21:37,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:21:37,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1234280724] [2020-07-21 13:21:37,916 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:21:39,512 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:21:39,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:21:39,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 2794 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:21:39,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:21:40,872 INFO L134 CoverageAnalysis]: Checked inductivity of 46975 backedges. 972 proven. 2842 refuted. 0 times theorem prover too weak. 43161 trivial. 0 not checked. [2020-07-21 13:21:40,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:21:44,319 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:21:44,440 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:21:44,568 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:21:44,698 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:21:46,952 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:21:47,088 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:21:47,232 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:21:47,376 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:21:47,518 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 13:21:47,648 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 13:21:47,771 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:21:47,886 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 13:21:47,992 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:22:03,594 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:03,699 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:04,666 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:22:04,789 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:22:04,919 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:05,051 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:05,175 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 13:22:05,290 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 13:22:05,396 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:22:05,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:12,885 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:12,996 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:13,106 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:22:13,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:13,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:18,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:18,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:19,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:19,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:20,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:20,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:20,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:20,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:21,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:21,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:21,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:23,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:26,338 INFO L134 CoverageAnalysis]: Checked inductivity of 46975 backedges. 976 proven. 2868 refuted. 0 times theorem prover too weak. 43131 trivial. 0 not checked. [2020-07-21 13:22:26,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1234280724] [2020-07-21 13:22:26,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:22:26,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 13:22:26,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792347765] [2020-07-21 13:22:26,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:22:26,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:22:26,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:22:26,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:22:26,341 INFO L87 Difference]: Start difference. First operand 276 states and 872 transitions. Second operand 21 states. [2020-07-21 13:22:28,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:22:28,174 INFO L93 Difference]: Finished difference Result 373 states and 1321 transitions. [2020-07-21 13:22:28,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:22:28,183 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1255 [2020-07-21 13:22:28,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:22:28,190 INFO L225 Difference]: With dead ends: 373 [2020-07-21 13:22:28,190 INFO L226 Difference]: Without dead ends: 353 [2020-07-21 13:22:28,193 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2517 GetRequests, 2473 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:22:28,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-21 13:22:28,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 263. [2020-07-21 13:22:28,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 263 states. [2020-07-21 13:22:28,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 776 transitions. [2020-07-21 13:22:28,230 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 776 transitions. Word has length 1255 [2020-07-21 13:22:28,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:22:28,230 INFO L479 AbstractCegarLoop]: Abstraction has 263 states and 776 transitions. [2020-07-21 13:22:28,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:22:28,231 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 776 transitions. [2020-07-21 13:22:28,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1017 [2020-07-21 13:22:28,242 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:22:28,243 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 73, 73, 61, 54, 38, 38, 38, 38, 38, 38, 38, 36, 36, 36, 36, 36, 36, 36, 25, 19, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:22:28,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:22:28,444 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:22:28,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:22:28,445 INFO L82 PathProgramCache]: Analyzing trace with hash -183925637, now seen corresponding path program 27 times [2020-07-21 13:22:28,446 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:22:28,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1750211686] [2020-07-21 13:22:28,446 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:22:29,898 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:22:29,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:22:29,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 2259 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:22:29,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:22:30,920 INFO L134 CoverageAnalysis]: Checked inductivity of 30505 backedges. 1028 proven. 2453 refuted. 0 times theorem prover too weak. 27024 trivial. 0 not checked. [2020-07-21 13:22:30,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:22:33,299 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:22:33,405 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:22:33,523 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:33,641 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:34,437 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:22:34,567 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:22:34,699 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:34,834 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:35,808 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:22:35,949 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:22:36,101 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:22:36,253 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:22:37,633 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:22:37,795 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:22:37,965 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:22:38,135 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:22:38,302 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 13:22:38,455 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 13:22:38,594 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 13:22:38,728 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 13:22:38,853 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:22:38,969 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 13:22:39,079 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:22:47,585 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:22:47,692 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:22:47,811 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:47,928 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:48,730 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:22:48,858 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:22:48,992 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:49,127 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:50,110 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:22:50,252 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:22:50,404 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:22:50,558 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:22:50,703 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 13:22:50,839 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 13:22:50,969 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 13:22:51,087 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:22:51,196 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:22:51,300 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:51,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:51,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:57,783 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:22:57,895 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:22:58,015 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:58,128 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:22:58,935 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:22:59,064 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:22:59,203 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:59,336 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 13:22:59,466 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 13:22:59,585 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:22:59,694 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 13:22:59,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:59,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:05,324 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:23:05,432 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:23:05,549 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:23:05,671 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:23:05,781 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 13:23:06,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:06,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:07,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:07,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:09,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:09,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:09,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:10,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:10,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:10,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:11,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:12,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:14,458 INFO L134 CoverageAnalysis]: Checked inductivity of 30505 backedges. 1034 proven. 2491 refuted. 0 times theorem prover too weak. 26980 trivial. 0 not checked. [2020-07-21 13:23:14,459 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1750211686] [2020-07-21 13:23:14,459 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:14,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 13:23:14,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448989356] [2020-07-21 13:23:14,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:23:14,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:14,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:23:14,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:23:14,462 INFO L87 Difference]: Start difference. First operand 263 states and 776 transitions. Second operand 23 states. [2020-07-21 13:23:16,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:16,861 INFO L93 Difference]: Finished difference Result 390 states and 1320 transitions. [2020-07-21 13:23:16,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:23:16,870 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1016 [2020-07-21 13:23:16,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:16,876 INFO L225 Difference]: With dead ends: 390 [2020-07-21 13:23:16,876 INFO L226 Difference]: Without dead ends: 341 [2020-07-21 13:23:16,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2040 GetRequests, 1991 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:23:16,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2020-07-21 13:23:16,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 290. [2020-07-21 13:23:16,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2020-07-21 13:23:16,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 969 transitions. [2020-07-21 13:23:16,916 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 969 transitions. Word has length 1016 [2020-07-21 13:23:16,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:16,916 INFO L479 AbstractCegarLoop]: Abstraction has 290 states and 969 transitions. [2020-07-21 13:23:16,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:23:16,916 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 969 transitions. [2020-07-21 13:23:16,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1193 [2020-07-21 13:23:16,937 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:16,937 INFO L422 BasicCegarLoop]: trace histogram [97, 97, 80, 80, 62, 61, 48, 48, 48, 48, 48, 48, 48, 40, 40, 40, 40, 40, 40, 40, 36, 21, 18, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:17,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:17,138 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:17,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:17,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1035955979, now seen corresponding path program 28 times [2020-07-21 13:23:17,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:17,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1174861530] [2020-07-21 13:23:17,141 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:18,675 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:18,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:18,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 2653 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:23:18,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:19,547 INFO L134 CoverageAnalysis]: Checked inductivity of 42617 backedges. 853 proven. 2325 refuted. 0 times theorem prover too weak. 39439 trivial. 0 not checked. [2020-07-21 13:23:19,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:23,154 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:23:23,258 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:23:23,371 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:23:23,483 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 13:23:25,586 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:23:25,707 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:23:25,836 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 13:23:25,965 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 13:23:26,089 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 13:23:26,203 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 13:23:39,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:39,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:42,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:46,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:46,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:46,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:47,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:47,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:47,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:47,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:48,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:50,203 INFO L134 CoverageAnalysis]: Checked inductivity of 42617 backedges. 853 proven. 2348 refuted. 0 times theorem prover too weak. 39416 trivial. 0 not checked. [2020-07-21 13:23:50,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1174861530] [2020-07-21 13:23:50,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:50,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 13:23:50,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754404415] [2020-07-21 13:23:50,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:23:50,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:50,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:23:50,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:23:50,205 INFO L87 Difference]: Start difference. First operand 290 states and 969 transitions. Second operand 19 states. [2020-07-21 13:23:51,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:51,409 INFO L93 Difference]: Finished difference Result 471 states and 2070 transitions. [2020-07-21 13:23:51,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:23:51,412 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1192 [2020-07-21 13:23:51,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:51,423 INFO L225 Difference]: With dead ends: 471 [2020-07-21 13:23:51,423 INFO L226 Difference]: Without dead ends: 453 [2020-07-21 13:23:51,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2390 GetRequests, 2351 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:23:51,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2020-07-21 13:23:51,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 281. [2020-07-21 13:23:51,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 281 states. [2020-07-21 13:23:51,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 912 transitions. [2020-07-21 13:23:51,468 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 912 transitions. Word has length 1192 [2020-07-21 13:23:51,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:51,469 INFO L479 AbstractCegarLoop]: Abstraction has 281 states and 912 transitions. [2020-07-21 13:23:51,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:23:51,469 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 912 transitions. [2020-07-21 13:23:51,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1672 [2020-07-21 13:23:51,490 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:51,491 INFO L422 BasicCegarLoop]: trace histogram [135, 135, 112, 112, 92, 90, 67, 67, 67, 67, 67, 67, 67, 56, 56, 56, 56, 56, 56, 56, 45, 34, 25, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:51,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:51,692 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:51,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:51,693 INFO L82 PathProgramCache]: Analyzing trace with hash 815920846, now seen corresponding path program 29 times [2020-07-21 13:23:51,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:51,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647376154] [2020-07-21 13:23:51,694 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:53,376 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:53,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:53,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 3716 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:23:53,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:54,700 INFO L134 CoverageAnalysis]: Checked inductivity of 84239 backedges. 1356 proven. 4494 refuted. 0 times theorem prover too weak. 78389 trivial. 0 not checked. [2020-07-21 13:23:54,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:58,355 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:24:00,458 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:24:00,563 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 13:24:00,683 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:24:00,808 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 13:24:18,019 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:24:18,125 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 13:24:18,237 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:24:18,352 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:24:18,463 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 13:24:18,771 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 13:24:19,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts